I've been thinking about giving SteamOS a try even if it's in Beta stage. But I'm at the point of lazyness where I'd consider going out, buying another 1TB HDD, installing it and then installing SteamOS on it to be easier than just clean up one of my three partitions on the existing HDD.

As if they'd just stop supporting DX11 immediately after DX12 launches. It won't happen. Hell some of them still support DX7 and DX9 and we've had DX11 for how long now? They'll cut the DX11 support eventually, but I wouldn't count on it being anytime soon after DX12 launches.

As for Win10, I'm not sure about it, I didn't upgrade to 8 or 8.1 because I disliked, and still do, the minimalist icons and UI. If Win10 appears to be a huge advance over Win7, Ultimate 64bit versions of both, then I'll probably upgrade. This also depends if certain people will be able to do certain thing with Win10 like they did with every Windows up to 7, because 8 and 8.1 don't seem to have a working .... . Unless M$oft really introduces like a yearly subscription plan for Win10 which isn't too expensive, then I'll consider paying for it.